From eb607b9736386844dc1aac6005d6ec95e270f0c0 Mon Sep 17 00:00:00 2001
From: Alexey Sokolov <alexey+znc@asokolov.org>
Date: Mon, 5 Feb 2024 22:44:42 +0000
Subject: [PATCH] Don't send 333 to client if topic owner is unknown

Fix #1889
---
 src/Chan.cpp | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/Chan.cpp b/src/Chan.cpp
index 8ec03574..4eff1c5b 100644
--- a/src/Chan.cpp
+++ b/src/Chan.cpp
@@ -156,11 +156,13 @@ void CChan::AttachUser(CClient* pClient) {
                                 m_pNetwork->GetIRCNick().GetNick() + " " +
                                 GetName() + " :" + GetTopic(),
                             pClient);
-        m_pNetwork->PutUser(":" + m_pNetwork->GetIRCServer() + " 333 " +
-                                m_pNetwork->GetIRCNick().GetNick() + " " +
-                                GetName() + " " + GetTopicOwner() + " " +
-                                CString(GetTopicDate()),
-                            pClient);
+        if (!GetTopicOwner().empty()) {
+            m_pNetwork->PutUser(":" + m_pNetwork->GetIRCServer() + " 333 " +
+                                    m_pNetwork->GetIRCNick().GetNick() + " " +
+                                    GetName() + " " + GetTopicOwner() + " " +
+                                    CString(GetTopicDate()),
+                                pClient);
+        }
     }
 
     CString sPre = ":" + m_pNetwork->GetIRCServer() + " 353 " +